Tips and tricks in C# .NET
May 15, 2015 1 Comment
In this post we saw one way to declare natural ordering for a custom class by implementing the generic IComparable of T interface. In this post we’ll look at how to achieve the same by overriding the 4 comparison operators:
< > <= >=
May 13, 2015 2 Comments
In this post we saw how to build an enumeration that can be combined using the bitwise OR, i.e. | operator:
var frontEndProgrammer = SoftwarePositions.Programmer | SoftwarePositions.FrontEnd;
We saw that enumeration values must be set in powers of two:
May 12, 2015 1 Comment
In this post we saw how to use the generic IEqualityComparer of T interface to indicate equality for our custom types. If you need a similar comparer for strings then there’s a ready-made static class called StringComparer which can construct string comparers for you.
The StringComparer class provides comparers for the common string comparison scenarios: ordinal, locale specific and invariant culture comparisons. This is a good MSDN article on the differences between these.
May 8, 2015 1 Comment
In this post we saw how to implement the generic IEquatable interface to make two custom objects equatable using the static Equals method.
You’re probably aware of the equality operator ‘==’ in C#. Let’s see what happens if you try to use it for a custom object:
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
}
May 6, 2015 2 Comments
The generic IEqualityComparer of T provides you a way to indicate whether two custom objects are equal. We’ve looked at equality in a number of posts on this blog – see the link below if you’re curious – and IEqualityComparer fulfils a similar purpose though its usage is different.
Equality comparers are most often used to filter out duplicates from a collection.
Consider the following class:
May 5, 2015 5 Comments
In this short post we’ll see a way how to make two custom objects equatable using the generic IEquatable interface. Consider the following object:
public class Person
{
public int Id { get; set; }
public string Name { get; set; }
public int Age { get; set; }
}
The object superclass has an Equals method that we can test as follows:
May 1, 2015 Leave a comment
In this post we showed how to declare natural ordering for a custom type by implementing the generic IComparable interface. We saw that it required us to implement the CompareTo method. The example we looked at was a simple Triangle class where we said that triangles can be ordered based on their areas. That’s probably a reasonable comparison for triangle.
However, what about the following object?
public class Building
{
public double Area { get; set; }
public int NumberOfRooms { get; set; }
public string Address { get; set; }
public bool ForSale { get; set; }
public DateTime DateBuilt { get; set; }
}
April 29, 2015 Leave a comment
Primitive types such as integers can be ordered naturally in some way. Numeric and alphabetical ordering comes in handy with numbers and strings. However, there’s no natural ordering for your own custom objects with a number of properties.
Consider the following Triangle class:
public class Triangle
{
public double BaseSide { get; set; }
public double Height { get; set; }
public double Area
{
get
{
return (BaseSide * Height) / 2;
}
}
}
April 28, 2015 5 Comments
You can normally use the URI object to construct URIs in C#. However, there’s an object called UriBuilder which lets you build up a URI from various elements.
Here’s an example to construct a simple HTTP address with a scheme, a host and a path:
UriBuilder uriBuilder = new UriBuilder(); uriBuilder.Scheme = "http"; uriBuilder.Host = "cnn.com"; uriBuilder.Path = "americas"; Uri uri = uriBuilder.Uri;
uri will be “http://cnn.com/americas”
April 22, 2015 2 Comments
In this we saw how to convert between numeric types explicitly and implicitly. There are other ways to implement conversions in C#. You must have come across the System.Convert static methods such as System.ConvertToInt32 or System.ConvertToByte.
You can implement your own conversions by implementing the IConvertible interface. Consider the following object:
public class House
{
public double Area { get; set; }
public int NumberOfRooms { get; set; }
public string Address { get; set; }
public bool ForSale { get; set; }
public DateTime DateBuilt { get; set; }
}
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